Snap-mold jacket.



E. H. PDTNAM.

SNAP MOLD JACKET.

APPLICATION FILED FEB. 14, 1912.

1,026,700. Patented May 21, 1912;

AP" co., WASHINGTON n c EDWARD H.

PUTNAM, or MOLINE, ILLINOIS.

SNAP-MOLD JACKET.

Specification of Letters Patent.

Patented May 21, 1912 Application filed February 14, 1912. Serial No. 677,587.

To all whom it may concern:

Be it known that I, EDWARD H. PUTNAM, a resident of Moline, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Snap-Mold Jackets, of which the following is a specification.

My invention relates in general to jackets for molds, and more particularly to molds formed in a snap-flask or casing adapted to be removed as soon as the mold has been construct-ed. As is known to those skilled in the art, such a flask or casing is used to build up a number of molds which are allowed to accumulate until a sufficient number have been obtained. The molds are then poured in rapid succession. Before each mold receives its metal a jacket is positioned about it to prevent the mold from spread ing or breaking down when the molten metal is poured into the cavity therein. Shortly after the metal is poured the acket is removed and positioned about an unpoured mold. .As all the molds must be poured before the metal cools it is essential that these jackets be removed and positioned about succeeding molds as rapidly and easily as possible, the time available for these operations being so short that little care can be employed in their performance. These jackets have theretofore been made by constructing a plain rectangular board frame or flask adapted to fit a mold snugly on all its vertical faces, having to this end the opposite faces of the jacket parallel. Where such jackets are used many of the molds are destroyed as such jackets often shrink slightly and fit too tightly upon the mold, so as to rub and scrape their way down the sides of the sand body, frequently cracking and mashing the mold. Additional difliculty is attendant upon their use in that the molds about which they are positioned must be regular and perfect in form requiring that the snap-flasks be accurate and unworn by use.

I am aware that jackets larger at the bottom than at the top have been tested and employed to a limited extent, but these have been found impracticable in that it has been impossible to so construct them that they will fit evenly along the vertical faces of the mold, being both too tight in some places and too loose in others.

A principal aim of my invention is to produce a jacket which may be quickly and easily positioned about a snap mold without danger of injuring the mold, and which shall provide at all points about the vertical periphery of the mold sufficient support and restraint to insure proper stability When the metal is poured.

A further aim of my invention is to provide at intervals about the periphery of the mold eificient vents or passages to permit the gases incidental to the pouring of the mold to pass off, this obviating the formation of blow-holes, or cavities, in the castings, which result from confined gases.

Further aims and advantages of my invention will be apparent as it is better understood from the following description, which taken in connection with the accompanying drawing illustrates one preferred embodiment thereof.

On the drawing :Figure 1 is a top plan View of a jacket made in pursuance of my invention, and shown in position upon a mold, Fig. 2 is a side elevation of Fig. 1, and Fig. 3 is a vertical section on line 33 ofFig. 1.

In the drawing, 5 indicates a hollow casing of any desired form, construction, weight and size, but preferably having its internal faces inclined so that opposite faces converge from the bottom 6 to the top 7 of the jacket. The internal faces of the jacket are formed preferably by disposing sheets of serrated or corrugated metallic material about the interior of the casing with the serrations or corrugations extending transversely of the said faces and forming a plurality of inwardly extending ribs or fingers 8, disposed at frequent intervals across the entire width of the said faces. It will be manifest, however, that these ribs may be constructed in various other ways and formed of any desired material. The bottoms of the ribs are preferably closed in a suitable fashion to prevent them from injuring the sand body of a mold or becoming clogged and needlessly weighted with the sand or other material constituting the molds.

WVhen a jacket made in pursuance of my invention is to be positioned about a snapmold, it may be telescoped thereupon with little or no danger of damaging the mold; and this by reason of the flaring form or slightly larger bottom area of the jacket; and by reason of the favorable form of the lower ends of the jacket ribs for entering the material of the mold, and for thus inserting or bedding the bodies of the ribs or fingers within the vertical side-walls of the mold, as the jacketis moved downwardly, into position; and the mold being of such horizontal area, relatively to the interior area of the jacket, that, in no case, will its material completely fill the grooves between the ribs or fingers of the jacket. When such a mold is in position it is therefore obvious that it is in contact with the mold only at intervals about the periphery of the mold, providing thereby ample ventilation between the ribs to carry off any and all gases incidental to the pouring of the mold and effectively obviating all danger from gasgeneration. Such a jacket may be quickly positioned and quickly removed without danger of scraping or unduly compressing the sand or other material forming the mold, and at the same time providing ample support and restraint, when in position, to prevent the mold from being distorted or broken by the force of the molten metal introduced therein through the pouring cavity.

Numerous changes in the details of construction and materials, as well as the arrangement of the fingers or ribs, may be resorted to without departing from the spirit or scope of my invention, or sacrificing any of the advantages hereinbefore described.

I claim 1. A snap mold jacket having a plurality of recesses extending transversely across its inner faces whereby the jacket is adapted to engage a mold vertically at intervals about its periphery.

2. A snap mold jacket having two opposite inner faces converging from the bottom to the top of the jacket, and adapted to engage a mold vertically at intervals about its periphery.

Copies of this patent may be obtained for 3. Asnap mold jacket having its opposite inner faces converging from the bottom to the top of the jacket and adapted to engage a mold vertically at intervals about its periphery.

A. A snap mold jacket having its inner faces provided with a plurality of inwardly extending ribs adapted to engage a mold vertically at intervals about its periphery.

5. A snap mold jacket having itsinner faces inclined and provided with a plurality of inwardly extending ribs adapted to enter partially the material of a mold when the jacket is positioned thereabout.

6. A snap mold jacket having an inclined inner face and provided with a plurality of inwardly extending ribs adapted to enter partially the material of a mold when the jacket is positioned thereabout.

7. A snap mold jacket having its inner faces provided with a plurality of inwardly extending ribs adapted to engage a mold at intervals, and pro-vided with recesses disposed between the said ribs adapted to serve as vents to carry off the gases incidental to the pouring of the mold.

8. A snap mold jacket having its opposite inner faces converging from the bottom to the top of the jacket, said faces being provided with recesses transversely disposed thereacross for carrying ofi the gases incidental to the pouring of the mold.

9. A jacket adapted to embracea snap mold, said jacket having its opposite inner faces converging from the bottom to the top of the jacket, and having an internal horizontal area at its top greater than the horizontal area of the said mold.

EDWARD H. PUTNANL Witnesses i O. BEAM, WV. Parsons.

five cents each, by addressing the Gommissioner of Patents,

Washington, D. G. 

